Sharpening device



July29, 1930. s, BRQWN 1,771,840-

SHARPENING DEVICE Filed Jan. 11, 1927 2 Sheets-Sheet 1 Y "SINETQR ATTORNEY$ July 29, '1930. R. 5. BROWN SHARPENING DEVICE 2 Sheets-Sheet 2 Filed Jan. 11, 1927 I NVENTOR ATTORN EYS Patented July 29, 1930 UNITED ST S PATEN QF'FICE aww uu...

:RQBERT s. BROWN, on NEW BarrAi'N; oomvncriour, ASSIGNOR mo Tim ivnw BRITA N MACHINE COMPANY, NECTIGUT or nEwBai'rAnv, CONNECTICUT, A CORPORATION or coni simarnnme DEVICE Application filed January 11, 1927; I Serial (No. 160354.

This "invention-1 relates to machines for 'sh'arpeningcutter teeth, and is of particular utility for; the purpose of'sharpenin'g the teeth of a chain cutter such as used on chain mortising machines. The present invention is priiarily an improvement on the construction setforth in my former patent, 896,357, dated August 18, 1908, and has for its object theprovision of novel means designed to mechanically guarantee a substantially uniform grinding ofall of the chain teeth so that they will be ofthe same height whereby each tooth willperform itsproper share of the work to be done. The construction is also such that the grinding machine may be adjusted so as to cut'theteeth with different degrees of hook; that is to say, a toothfor working on soft wood should desirably havea different degree of hook than that intended to work on hard Wood. These and other objects will be aj mortising' 'machine,

bepu't, might be made. I

apparent to the mechanic skilled in this art from a reading of the following description. While I have shown my invention as applied to sharpening the teeth: on a chain cutter for the use of the invention is not necessarily limited theretoas 'it is "obvious that various -modiiications and changes, such as might-be desirable in'the different uses to which the invention might V drawings Which I show one preferred embodiment of my invention- I Fig.1 is a top plan View 1 Fig. 2 is a side elevation, certain parts being shown in section on, the line 2-2 of Fig.3 is a front elevation showing certain partsin section; i 1 j Fig.4: is a view partly in section ofcertain In the accompanying -parts correspondingto like parts shown in I Fig. 2, but in a different.position;'

Figib iis a ise'ction on the line "of" Fi 1 ce rtain partslbeing in' elevation;

"Fig. 6- is an end'elevation of certain details; r

Fig. 7 is a relatively-enlarged view ofa sprocket with apart of a chaincutter thereon '-showing. part of a grinder in position .to grind a'toothon' one of the chain links.

and lon itudinally V hereinafter. described. This rod 1 m reality terminates just tofithe rear of'the grin "disc 14 and may be providedwithapacking e' heMQ d? pac i iiut .1 hr ent packin'gjbeing to excl defrom the rodsb'ear- 5represents v ing a suitable base: designed to rest upon an appropriate support. The upper part ofthe frame is projected forwardly and isprovided with a cross bearing 9 in which is journaled a shaft 12 for the grinding tool 14:, which in this particular instance is in the form of a disc wheel. 13 is a belt pulley on the opposite enclof the shaft 12, which may receive aidriving belt as one conventional means fordriving'the grinding disc 14. 10 is a hood for the grinding disc 14, the same being secured to the top of the frame in any desiredinanner so as to overstand the disc and protect a wing nut at its upper end,sai d screw be-,

ing rotatable in alsuitableboss 20 carried by the frame. 26 is a clamping bolt which serves to clamp the carriage 25 tightly against the frame when 'itsproper vertical adjustment has been effected. Thusffar it might be'said thatthe parts described correspond closely to the correspondingly numbered parts ofthe 7 machine shown in my former patent.

3lis a bearing on the'upper 'part'o'f the carriage 25 said bearing furnishing a fore and aft passage for a shaft 36. This bearing is slitted atone side,

clamping bolt 35, whereby the bearingmay the frame ofthe machinehavi and is provided with a.

be tightened to hold the shaft '36 against turning, or loosened to permit saidshaft to turn for adjustment purposes. 31-37 are arms fixed to the ends of the shaft 36 and depending therefrom, V ed at their lower ends by a tubularb eari'n'g 38 forming I this bearing,a rod or shaft 39 rotatably movable for the; purpose the work carrier. Onefendoffthe bearing 38 v ing any thrown off particles of steel from the chain, or'abrasive from-the -disc, duringthe said arms being connect in effect a swingingbracket. In

of the bearing sleeve sleeve 48. 7 tion shoe 50. wh'ich 18 located in a recess-1n the moved longitudinally in'its bearing '38 and,

rotated therein as and when described; The opposite end of the rod 39 is provided with a head 46 having at its rear part longitudinal splines or ribs 47. 48 is a sleeve mounted on the rear end of the bearing 38, the same being provided with internal longitudinal grooves to receive the splines 01 ribs 47 so that when said splines slide in said grooves, the rod andsprocket 42 will be mechanicallyheld against rotation, and thus the indexing means performs the added important function of a guide. The forward end of the head 46. may make a sliding and rotating fit within the sleeve 48, and the forward ends of the splines. 47 may be sufficiently pointed or beveled-to easily enter the indexinggroovcs in said sleeve 48 when the rod 39 is advanced fromthe position shown'in Fig. 2. In the formshown in the drawings, it willbe observedthat there are a plurality of splines 47 entirely around the head 46, and there are a corresponding number of longitudinal grooves in the sleeve .48, said splines and grooves being so placed that the'rod 39 can be given a uniform step by step rotation from one operative position to another operative position. i In the particular form shown in the drawings,;the sprocket 42 has seven teeth while the splines on the indexing device are fourteen in number.. This gives the indexing device fourteen operative positions so that any pitch of chain with a mating seventoothed sprocket will be properly spaced without anychange in the indexing device. That part of the bearing 38, which receives the sleeve 48, maybe somewhat enlarged and recessed so as to receive the end of the indexing sleeve 48, and the mounting is preferably such that the sleeve may be adjusted angularly about its own axis. In nig. 5 I have shown in detail one convenient means for accomplishing this end. In this figure, 49 is a boltwhich passes through the enlarged end 38 tangentially to the At one end of the bolt 49. is a fricside of the bearing 38. .This friction shoe .50 'engagesrthe side wall of the f'sleeve 48,

. whichniay be slightly grooved if desired.

Then the bolt will grip the sleeve. 48, and hold it firmly in its adjusted. position. 151 is an adjusting screw in, the lower part ofv the swinging bracket which carries the rod 39. .This screw may have a knurledhead onits outer end 49 is tightened up, the shoe 50.

ed, the bolt 35 is again tightened up to lock the shaft 36 I hold the rod ment.

Operation: When the parts are assembled, the operator pulls outthe work carrying rod 39 so'thata chain cutter 43 may be placed on the sprocket 42 (see Fig. 2). He then pushes the rod 39 forwardly,whereupon the indexagainst rotation and thereby 39 in said position of adjusting splines on the head 46 will engage in the complementary indexing grooves in the sleeve 48. He then advances the rod until the cutter chain approaches sufliciently near to the lower side of the cutting disc 14 to enable him to determine whether the action of the disc on the particular tooth as now guided by the indexing device will be proper. If he finds that any adjustmentis required, it is possible for him, by using the various adjusting means,to raise or lower the work carrier and to move it laterally so that when the shapening opera- -tion is to occur, the wheel 14 will grind each individual tooth on the chain to the same degree and at the desired angle or hook. l/Vhen various parts snugly on the sprocket. Then, with the other hand, he advances'the rod 39. This carries the work forwardly to and under the grinder 14 (see Fig. 4). hen the tooth has been ground to its full depth, the operator draws the rod 39 outwardly and turns. it to the next indexing position whichwill bring the next chain tooth into the whereupon, the aforesaid operation is repeated until all of the teeth have been successively ground. It will be apparent that the amount of skill required to produce accurate and uniform grinding is greatly lessened since, when the parts have once been adjusted by an expert, the labor of grinding the chain may be turned over to the mechanic of less skill. It will also be apparent that, during the grinding operation, the work is held against the grinding disk mechanically by the combined guiding and indexing mechanism so that the operator has merely to'push the work carrier forwardly, the twisting strainthereonibeing all resisted by said in- '1 dexing'means. v

Since the'work carrier may be adjusted hothup anddo' wn and laterallywith respect proper grinding line,

said support I of said shaft,

against rotation 1n said bracket, said sleeve 1. A grinder for grinding corresponding teeth on a cutting device, comprislng a rotary I grindlng tool, a work carrier comprising a shaft rotatable and slidable longitudinally to present the work to the operation of the grinding tool, a support for the shaft, and an indexing means including corresponding projections and grooves on said shaft and its support, concentric with said shaft and coacting therewith to positively hold-the same against rotation during thegrinding operation, saidshaft being rotatable relatively to said indexing means when said work carrier stands in a non-grinding position. i a

2. A. grinder for grinding corresponding teeth on a cutting device, comprising a rotary grinding tool, a work carrier comprising a shaft rotatable and slidable longitudinally to present the work to the operation of the grinding tool, a support for the shaft, interengaging projections and grooves on said,

support and shaft to positively hold the shaft against rotation during the-grinding operation, said shaft being rotatable relatively to when said work carrier stands in a non-grinding position, and means for shifting the shaft supportfor adjusting the position of the shaft relatively to the grinding tool.

3. A grinder for grinding corresponding teeth on a cutting device, comprising a frame, a bracket, a rotary grindingtool, a work carrier comprising a shaft supported by said bracket and slidable longitudinally relative- 1y to said bracket to present the work to the operation of the grinding tool, a sleeve carried by said bracket and surrounding a part said sleeve being normally held and said shaft having interengaging projec-',

tions and grooves which coast to hold the shaft against rotation during the grinding operation, said shaft being rotatable relatively to said sleeve when said shaft in a non-grinding position, one of said two last 1 mentioned members being rotatably adjustable relative'to said bracket when said shaft is in its grinding position.

ROBERT s BROWN. 

